A solid-edged line of transition from the clear area to the darkened density of 0.9, or a 3 stop light reduction Perfect to balance the exposure when scenes have a sudden transition from the foreground to the sky True to life color, No color cast High definition optical glass with NiSi Nano Coating on both sides - waterproof, anti-reflection, scratch resistant, and easy to clean Compatible with the NiSi 100mm System and any other systems that hold 100x150mm filters with 2mm thickness